There is a hard - almost crusty white.. something.. that seems to be taking over the surface of my seedling pots. It started in one and gradually showed up in a few more. It is water resistant so when I water the plant, it pools on top of the substance and gradually soaks in. I can use a knife or anything really and break it off, but it shows up again the next day. They are in those degradable seedling pots and those are inside cheap plastic pots just while I harden them off. As I've taken some plants out to put in the ground, I noticed that the degradable pot itself had the white growth and the dirt inside the pot had green or white also. I'm assuming (hoping) that whatever it is will vanish upon putting them in the ground and I won't have to worry about it again - it was probably from those cheap plastic pots and the degradable ones just creating a hot, wet environment in the sun.
That said, what IS the stuff? I google white growing on seedling pots and get fuzzy white fungus results but this wasn't fuzzy. It was crusty and made the water pool on it. The first day I saw it was right after I had sprayed some neem oil in the garden. I didn't use it to spray the seedlings but I figured somehow I must've gotten some on the surface of that one plant and it did that. I've since decided that it had nothing to do with the neem at all.
